package com.atguigu.springcloud;

import com.atguigu.springcloud.entities.CommonResult;
import com.atguigu.springcloud.entities.Payment;
import com.atguigu.springcloud.lb.LoadBalance;
import com.atguigu.springcloud.lb.MyLB;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;
import javax.annotation.Resource;
import java.net.URI;
import java.util.List;

@RestController
@Slf4j
public class OrderController {

    @Autowired
    private LoadBalance loadBalance;

    @Autowired
    private DiscoveryClient discoveryClient;
    //public static final String PAYMENT_URL = "http://localhost:8001";
    public static final String PAYMENT_URL = "http://CLOUD-PAYMENT-SERVICE";//负载均衡

    @Resource
    private RestTemplate restTemplate;
    //使用方式(url,requestMap,responseBean.class)三个参数分别代表rest请求地址、请求参数、http响应转换成的对象类型
    //RestTemplate提供了多种便捷访问远程Http服务的方法，
    //是一种简单便捷的访问restful服务的模板类，是spring提供的用于访问Rest服务的客户端模板工具集。

    //getForObject返回响应体重数据转化成的对象，即json
    //getForEntity返回对象是ResponseEntity对象，包含了响应中的一些重要信息，比如响应头、响应状态码、响应体等

    @GetMapping("/consumer/payment/create")
    public CommonResult<Payment> create(Payment payment){
        return restTemplate.postForObject(PAYMENT_URL+"/payment/create",payment,CommonResult.class);
        //return restTemplate.postForEntity(PAYMENT_URL+"/payment/create",payment,CommonResult.class).getBody();
    }

    @GetMapping("/consumer/payment/get/{id}")
    public CommonResult<Payment> getPayment(@PathVariable("id") Long id){
        return restTemplate.getForObject(PAYMENT_URL+"/payment/get/"+id,CommonResult.class);
    }

    @GetMapping("/consumer/payment/getForEntity/{id}")
    public CommonResult<Payment> getPayment2(@PathVariable("id") Long id){
        ResponseEntity<CommonResult> entity = restTemplate.getForEntity(PAYMENT_URL+"/payment/get"+id,CommonResult.class);
        if (entity.getStatusCode().is2xxSuccessful()){//http请求编码2xx比如200
            return entity.getBody();
        }else{
            return new CommonResult<Payment>(444,"操作失败！");
        }
    }

    @GetMapping("/consumer/payment/lb")
    public String getPaymentLB(){
        List<ServiceInstance> instances = discoveryClient.getInstances("CLOUD-PAYMENT-SERVICE");
        if (instances == null || instances.size() <= 0) {
            return null;
        }
        ServiceInstance serviceInstance = loadBalance.instance(instances);
        URI uri = serviceInstance.getUri();

        return restTemplate.getForObject(uri + "/payment/lb", String.class);
    }

    @GetMapping("/consumer/paymentZipkin80")
    public String paymentZipkin80(){
        String result = restTemplate.getForObject("http://localhost:8001"+"/payment/paymentZipkin8001",String.class);
        return result;

    }
}
